@ bowzart
Concerning the appearance of formats, I've been doing some maths
and sketching. On the attachment you can see various formats
(square, 4x5, 645, 35mm, 612) and they are all of the same area.
To me the square appears slightly smaller than the rest of it and the
612 slightly larger than the rest of it. But I'm not sure as, to me, the
difference is minute.
OTOH, if the difference is minute, why bother at all ? If you want a picture
of a series of pictures to stand out above the others, I think you really
have to move up a size (8x10 > 12x16), then it stands out. But if I print them
all the same area, within a certain range, none of the pictures will stand out.
Much ado about nothing then.